Caffeine Volume

One most important substances in my daily life is caffeine. Caffeine has the strong power to blow my sleepiness away and give me vitality. 

But, these days, I often wrong the use of it. I drink some beverage that contains caffeine such as coffee, black tea, green tea, and so on. Then I have taken a lot of caffeine unconsciously in a short time. Much caffeine causes fatigue, and this fault ofthen happens to me. Therefore, I must be careful how much caffeine I get the day and adjust the volume.